Doctrine and join result type - symfony

Question

I've 2 simple tables with many-to-one mono directional relations:
class Event extends BaseEvent
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
*
* #ORM\ManyToOne(targetEntity="Rposition")
* #ORM\JoinColumn(name="owner", referencedColumnName="id",onDelete="CASCADE", nullable=false )
**/
private $owner;
....
and the origin of the owner field class:
class Rposition
{
/**
* #var integer
*
* #ORM\Column(name="id", type="string", length=36)
* #ORM\Id
* #ORM\GeneratedValue(strategy="UUID")
*/
private $id;
/**
*
*
* #ORM\Column(name="scenario", type="string", length=255, nullable=false)
*/
private $scenario;
both class having the right getter/setter and a __tostring()
I need to implements a query like this:
public function findAllByScenario($scenario) {
$q = $this->getEntityManager()->createQuery("SELECT e , r.scenario , r.id
FROM LapoMymeBundle:Event e
JOIN LapoMymeBundle:Rposition r
WITH e.owner = r.id
WHERE r.scenario = :scenario
ORDER BY e.start ASC, e.end ASC
")->setParameter('scenario', $scenario);
try {
return $q->getResult();
} catch (\Doctrine\ORM\NoResultException $e) {
return null;
}
}
-is it the right way to making a join and sending back result from it?
-what are the right way for fetching the fields from the array of objects?
something like that's:
$events=$this->getDoctrine()->getManager()
->getRepository('LapoMymeBundle:Event')->findAllByScenario($scenario);
$outputUsersArray = Array();
foreach($events as $event)
{
$eventArray = Array();
$eventArray[JSONResponseFields::KEY_ID] = $event->getId();
$eventArray[JSONResponseFields::KEY_NAME] = $event->getOwner()->getId();
$outputEventsArray[] = $eventArray;
} ....
rise an error likes:
FatalErrorException: Error: Call to a member function getId() on a non-object in.....

Answer 1

You can use Doctrine Query builder to get this working. Assuming you have Querybuilder instance. The query would look like
$qb = this->getDoctrine()->getRepository('BundleName:Event')->createQueryBuilder('e');
$query = $qb
->select('e','p')
->innerjoin('u.owner','r')
->where('r.scenario= :scenario')
->setParameter('scenario', $scenarioid)
->getQuery();
$chatuser = $query->getResult();